Because there is no pass-by-reference in C function
calling, you must use pointers for the changes made in the callee
to be reflected at the caller. Due to the nature of the [out] attribute,
all DFC arguments declared with the [out] attribute
are treated as a pointer internally within the stub code, even if
the argument itself is declared as a regular variable within the
DFC signature in the IDL file. When you call a DFC with any [out] attributes
in the code, you must pass in a pointer for the corresponding argument.
To minimize errors and confusion, define [out] arguments
as pointers in DFCs.
See the sample file, below, for an example of how to define
the DFCs listed in your IDL file. If you use strings (struct
istr) or blobs (struct
iblob), you must include the following:
#include <IMPACT/Structs.h>
If you are developing a C++ or C-based AIM, you must include:
#include “CustomAcquirePluginImpl.h” //client
#include “CustomAcquirePluginDef.ht” //UNIX client only
#include “CustomServerPluginImpl.h” //server
#include “CustomSeriverPluinDef.h” //UNIX server only
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